In the dark

In an effort to save energy contractors install occupancy sensors in offices at the Niagara Falls Air reserve Station, November 26 2013 Niagara Falls, N.Y. These newly installed sensors automatically turn off the lights when a room is left unoccupied for 10 minutes, turning them back on when personnel re-enter. (U.S. Air Force photo by Tech. Sgt. Joseph McKee)

PHOTO BY: Tech. Sgt. Joseph McKee
VIRIN: 131126-F-DS336-002.JPG
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